Function unescape

internal/diff_str.ts:24–36

(string: string)

 * ```
 */
export function unescape(string: string): string {
  return string
    .replaceAll("\\", "\\\\")
    .replaceAll("\b", "\\b")
    .replaceAll("\f", "\\f")
    .replaceAll("\t", "\\t")
    .replaceAll("\v", "\\v")
    // This does not remove line breaks
    .replaceAll(
      /\r\n|\r|\n/g,
      (str) => str === "\r" ? "\\r" : str === "\n" ? "\\n\n" : "\\r\\n\r\n",
    );
}

const WHITESPACE_SYMBOLS_REGEXP =
  /((?:\\[bftv]|[^\S\r\n])+|\\[rn\\]|[()[\]{}'"\r\n]|\b)/;